ESTRO 2025 - Abstract Book

S4298

RTT - Service evaluation, quality assurance and risk management

ESTRO 2025

Conclusion: The proactive analysis (MARRTA) enables the detection of high-risk initiating events and the implementation of safeguards to enhance patient treatment safety, while the retrospective analysis (SAFRON) serves as an effective tool for identifying incidents. Together, these systems have allowed us to improve the overall quality of patient care.

Keywords: MARRTA, SAFRON, risk

References: European Commission. (2015). “Technical supplement to Radiation Protection n 181: General guidelines on risk management in external beam radiotherapy Sklet S Safety barriers definition classification and performance J Loss Prev Process WHO Radiotherapy Risk Profile Technical Manual 2008 Ford E Quality Control Quantification A tool to measure the value of quality control checks in radiation oncology AAPM TG 100 Application of risk analysis methods to radiation therapy quality management Med Phys 2016

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Digital Poster Optimizing Resource Utilization in MRI-Guided Adaptive Radiotherapy: Enhancing Efficiency and Treatment Quality Elizabeth Denney, Silvia Fabiano, Matthais Guckenberger, Michael Baumgartl, Klara Kefer, Sophie Perryck, Jens von

der Grün, Lotte Wilke, Micheal Mayinger, Stephanie Tanadini-Lang Radio-Onkologie, University Hospital Zürich, Zürich, Switzerland

Purpose/Objective: The integration of MRI and Linac in a single device in radiation oncology enables online-daily adaptive treatments across multiple anatomical sites, but requires patients to occupy the machine for the entire session. This study aims to assess and compare resource utilization in treating patients with daily online-adaptive SBRT to pelvic lymph nodes, using (1) a Hybrid MRI-Linac and (2) a system consisting of a dedicated MRI simulator and CBCT-Linac treatment delivery. The latter has the potential to scan and treat patients in parallel, with adaptation performed outside the treatment machine, reducing machine occupancy. Material/Methods: Patients treated with SBRT to pelvic lymph nodes with daily online-adaptive planning on either (1) a 0.35T MR-Linac or (2) MR-guided TrueBeam Radiotherapy (Virtual MR-Linac) (Figure 1), which combines a 1.5T Magnetom SOLA scanner with a Varian TrueBeam Linac, were retrospectively assessed. The times required for image acquisition, adaptation time (including contouring, QA and patient transfer duration), and radiotherapy (RT) were evaluated and compared between both workflows. Notably, the Virtual MR-Linac is still in its developmental stage. The patients analyzed in this study are part of the initial workload establishment of this new work process.